Abstract
An electromechanical electret transducer which can be used for point-by-point continuous encoding of pen-drawn graphical data (electret tablet) is described. The tablet consists of a rigid insulating backplate and a thin electret foil separated from the backplate by a shallow air gap. Both foil and backplate are selectively metalized along parallel strips and positioned such that the strips on the foil are perpendicular to the strips on the backplate. Each overlap between foil metal strips and backplate metal strips forms an individual electret transducer [electroacoustic arrays of this kind are described in A. K. Nigam and G. M. Sessler, Appl. Phys. Letters 21, 229 (1972)]. The functional characteristics of the tablet are analyzed both theoretically and experimentally. Full-size tablets having a resolution of 3 lines/mm over a writing surface of about 30X30 cm2 appear feasible. The electret tablet is operable with an ordinary stylus, such as a fine-tip ballpoint pen, is unaffected by hand-pressure on the writing surface, and is capable of extremely fast digitization rates of up to 50 000 coordinate-pairs/sec.
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